<div class="row" >
    <div class="col-lg-4">
        <form role="form" name="input_bengkel" action="<?php echo site_url("jualbeli/input_kategori_jb");?>" method="post" enctype="multipart/form-data" >
            <div class="form-group">
                <label>Nama Kategori Jual Beli</label> <input class="form-control" name="namakategori"/>
            </div>
            <div class="form-group">
            <button type="submit" class="btn btn-primary">Simpan Data</button>
            </div>
        </form>    
    </div>
</div>